I have to admit that I have much doubt about my gender. If you had approached me as a kid and asked me about my gender I would of told you I was a girl on the spot as soon as I understood what you were saying.
But now that I am older and have absorbed male "stuff" as well as using all kinds of complex mechanisms to repress those original feelings I am not so sure.
For starters I seem to think mainly in words. I use lots of "internal voice's" ranging from fictional characters all the way to my own voice.
I defiantly find it more fun to use a male voice. Although sometimes I use a female one. I don't know what this means. Sometimes I feel like I am nit picking to try and find some piece of evidence that I am unquestionably male. It would defiantly fit with my personality.